XML 120 R60.htm IDEA: XBRL DOCUMENT v2.4.0.8

Loans - Weighted Average Risk Grades for All Commercial Loans by Class (Detail) (USD $) In Thousands, unless otherwise specified				9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Sep. 30, 2013 Commercial and industrial, Energy [Member] Grade	Dec. 31, 2012 Commercial and industrial, Energy [Member] Grade	Sep. 30, 2013 Commercial and industrial, Other commercial [Member] Grade	Dec. 31, 2012 Commercial and industrial, Other commercial [Member] Grade	Sep. 30, 2013 Commercial real estate, Buildings, land and other [Member] Grade	Dec. 31, 2012 Commercial real estate, Buildings, land and other [Member] Grade	Sep. 30, 2013 Commercial real estate, Construction [Member] Grade	Dec. 31, 2012 Commercial real estate, Construction [Member] Grade	Sep. 30, 2013 Risk grades 1-8 [Member] Commercial and industrial, Energy [Member] Grade	Dec. 31, 2012 Risk grades 1-8 [Member] Commercial and industrial, Energy [Member] Grade	Sep. 30, 2013 Risk grades 1-8 [Member] Commercial and industrial, Other commercial [Member] Grade	Dec. 31, 2012 Risk grades 1-8 [Member] Commercial and industrial, Other commercial [Member] Grade	Sep. 30, 2013 Risk grades 1-8 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Dec. 31, 2012 Risk grades 1-8 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Sep. 30, 2013 Risk grades 1-8 [Member] Commercial real estate, Construction [Member] Grade	Dec. 31, 2012 Risk grades 1-8 [Member] Commercial real estate, Construction [Member] Grade	Sep. 30, 2013 Risk grade 9 [Member] Commercial and industrial, Energy [Member] Grade	Dec. 31, 2012 Risk grade 9 [Member] Commercial and industrial, Energy [Member] Grade	Sep. 30, 2013 Risk grade 9 [Member] Commercial and industrial, Other commercial [Member] Grade	Dec. 31, 2012 Risk grade 9 [Member] Commercial and industrial, Other commercial [Member] Grade	Sep. 30, 2013 Risk grade 9 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Dec. 31, 2012 Risk grade 9 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Sep. 30, 2013 Risk grade 9 [Member] Commercial real estate, Construction [Member] Grade	Dec. 31, 2012 Risk grade 9 [Member] Commercial real estate, Construction [Member] Grade	Sep. 30, 2013 Risk grade 10 [Member] Commercial and industrial, Energy [Member] Grade	Dec. 31, 2012 Risk grade 10 [Member] Commercial and industrial, Energy [Member] Grade	Sep. 30, 2013 Risk grade 10 [Member] Commercial and industrial, Other commercial [Member] Grade	Dec. 31, 2012 Risk grade 10 [Member] Commercial and industrial, Other commercial [Member] Grade	Sep. 30, 2013 Risk grade 10 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Dec. 31, 2012 Risk grade 10 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Sep. 30, 2013 Risk grade 10 [Member] Commercial real estate, Construction [Member] Grade	Dec. 31, 2012 Risk grade 10 [Member] Commercial real estate, Construction [Member] Grade	Sep. 30, 2013 Risk grade 11 [Member] Commercial and industrial, Energy [Member] Grade	Dec. 31, 2012 Risk grade 11 [Member] Commercial and industrial, Energy [Member] Grade	Sep. 30, 2013 Risk grade 11 [Member] Commercial and industrial, Other commercial [Member] Grade	Dec. 31, 2012 Risk grade 11 [Member] Commercial and industrial, Other commercial [Member] Grade	Sep. 30, 2013 Risk grade 11 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Dec. 31, 2012 Risk grade 11 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Sep. 30, 2013 Risk grade 11 [Member] Commercial real estate, Construction [Member] Grade	Dec. 31, 2012 Risk grade 11 [Member] Commercial real estate, Construction [Member] Grade	Sep. 30, 2013 Risk grade 12 [Member] Commercial and industrial, Energy [Member] Grade	Dec. 31, 2012 Risk grade 12 [Member] Commercial and industrial, Energy [Member] Grade	Sep. 30, 2013 Risk grade 12 [Member] Commercial and industrial, Other commercial [Member] Grade	Dec. 31, 2012 Risk grade 12 [Member] Commercial and industrial, Other commercial [Member] Grade	Sep. 30, 2013 Risk grade 12 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Dec. 31, 2012 Risk grade 12 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Sep. 30, 2013 Risk grade 12 [Member] Commercial real estate, Construction [Member] Grade	Dec. 31, 2012 Risk grade 12 [Member] Commercial real estate, Construction [Member] Grade	Sep. 30, 2013 Risk grade 13 [Member] Commercial and industrial, Energy [Member] Grade	Dec. 31, 2012 Risk grade 13 [Member] Commercial and industrial, Energy [Member] Grade	Sep. 30, 2013 Risk grade 13 [Member] Commercial and industrial, Other commercial [Member] Grade	Dec. 31, 2012 Risk grade 13 [Member] Commercial and industrial, Other commercial [Member] Grade	Sep. 30, 2013 Risk grade 13 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Dec. 31, 2012 Risk grade 13 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Sep. 30, 2013 Risk grade 13 [Member] Commercial real estate, Construction [Member] Grade	Dec. 31, 2012 Risk grade 13 [Member] Commercial real estate, Construction [Member] Grade
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade				5.36	5.25	6.25	6.21	6.86	6.97	7.01	6.94	5.31	5.24	5.95	5.81	6.59	6.63	6.99	6.82	9.00	9.00	9.00	9.00	9.00	9.00	9.00	9.00	10.00	10.00	10.00	10.00	10.00	10.00	10.00	10.00	11.00	11.00	11.00	11.00	11.00	11.00	11.00	11.00	12.00	12.00	12.00	12.00	12.00	12.00	12.00	12.00	13.00	13.00	13.00	13.00	13.00	13.00	13.00	13.00
Loans	$ 4,808,672	$ 4,828,612	$ 4,486,301	$ 1,078,899	$ 1,083,186	$ 3,729,773	$ 3,745,426					$ 1,066,168	$ 1,081,725	$ 3,467,415	$ 3,367,443					$ 11,172	$ 392	$ 90,404	$ 250,508					$ 268	$ 0	$ 76,834	$ 28,440					$ 525	$ 0	$ 60,558	$ 53,797					$ 766	$ 169	$ 27,286	$ 40,603					$ 0	$ 900	$ 7,276	$ 4,635
Loans	3,370,969	3,319,795	3,250,135					2,958,440	2,711,489							2,742,070	2,460,448							70,918	92,041							50,321	42,603							54,405	77,658							38,384	35,602							2,342	3,137
Loans	$ 412,529	$ 608,306								$ 412,529	$ 608,306							$ 409,359	$ 579,108							$ 1,320	$ 23,046							$ 1,437	$ 4,435							$ 413	$ 617							$ 0	$ 1,100							$ 0	$ 0

X

- Definition

Weighted Average Risk Grade for Loans

+ References

No definition available.

+ Details

Name:	cfr_WeightedAverageRiskGradeForLoans
Namespace Prefix:	cfr_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

Amount before allowance of loans issued to commercial and industrial institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes real estate loans and loans covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5066-111524



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 210.9-03.7(a)(1))

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



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a(1)

-Article 9

+ Details

Name:	us-gaap_LoansReceivableCommercialAndIndustrial
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount before allowance of commercial construction loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5066-111524



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a

-Article 9



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a)(2))

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

+ Details

Name:	us-gaap_LoansReceivableCommercialConstruction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5066-111524



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a

-Article 9



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a))

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



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(c))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_LoansReceivableCommercialRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant