XML 32 R32.htm IDEA: XBRL DOCUMENT  v2.3.0.11

Allowance for Probable Loan Losses (Details 2) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	$ 92,238	$ 125,200
Loans individually evaluated for impairment, Allowance	12,642	12,171
Loans collectively evaluated for impairment, Recorded Investment	5,163,945	5,284,803
Loans collectively evaluated for impairment, Allowance	65,839	72,311
Commercial
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	23,365	23,426
Loans individually evaluated for impairment, Allowance	7,937	8,138
Loans collectively evaluated for impairment, Recorded Investment	799,557	807,098
Loans collectively evaluated for impairment, Allowance	12,690	13,908
Commercial real estate: other construction and land development
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	32,674	77,207
Loans individually evaluated for impairment, Allowance	371	592
Loans collectively evaluated for impairment, Recorded Investment	1,264,973	1,396,264
Loans collectively evaluated for impairment, Allowance	19,705	26,103
Commercial real estate: farmland and commercial
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	31,340	21,844
Loans individually evaluated for impairment, Allowance	4,334	3,441
Loans collectively evaluated for impairment, Recorded Investment	1,691,043	1,666,719
Loans collectively evaluated for impairment, Allowance	16,994	12,899
Commercial real estate: multifamily
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	440	473
Loans collectively evaluated for impairment, Recorded Investment	112,289	96,318
Loans collectively evaluated for impairment, Allowance	854	53
Residential: first lien
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	1,799	2,015
Loans collectively evaluated for impairment, Recorded Investment	534,678	531,440
Loans collectively evaluated for impairment, Allowance	6,110	10,059
Residential: junior lien
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	1,519	199
Loans collectively evaluated for impairment, Recorded Investment	405,982	415,328
Loans collectively evaluated for impairment, Allowance	5,533	2,611
Consumer
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	1,100	29
Loans collectively evaluated for impairment, Recorded Investment	107,013	126,018
Loans collectively evaluated for impairment, Allowance	2,378	6,241
Foreign
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	1	7
Loans collectively evaluated for impairment, Recorded Investment	248,410	245,618
Loans collectively evaluated for impairment, Allowance	$ 1,575	$ 437

X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ Details

Name:	iboc_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairments
Namespace Prefix:	iboc
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524
-Subparagraph (g)

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524
-Subparagraph (h)

+ Details

Name:	us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524
-Subparagraph (h)

+ Details

Name:	us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant