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Allowance for Probable Loan Losses (Details 2) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	$ 137,893	$ 125,200
Loans individually evaluated for impairment, Allowance	19,066	12,171
Loans collectively evaluated for impairment, Recorded Investment	4,984,307	5,284,803
Loans collectively evaluated for impairment, Allowance	59,340	72,311
Commercial
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	23,673	23,426
Loans individually evaluated for impairment, Allowance	8,049	8,138
Loans collectively evaluated for impairment, Recorded Investment	746,430	807,098
Loans collectively evaluated for impairment, Allowance	11,531	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	61,286	77,207
Loans individually evaluated for impairment, Allowance	3,000	592
Loans collectively evaluated for impairment, Recorded Investment	1,194,082	1,396,264
Loans collectively evaluated for impairment, Allowance	15,282	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	47,301	21,844
Loans individually evaluated for impairment, Allowance	7,923	3,441
Loans collectively evaluated for impairment, Recorded Investment	1,656,066	1,666,719
Loans collectively evaluated for impairment, Allowance	16,021	12,899
Commercial real estate: multifamily
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	431	473
Loans collectively evaluated for impairment, Recorded Investment	116,978	96,318
Loans collectively evaluated for impairment, Allowance	1,049	53
Residential: first lien
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	2,181	2,015
Loans individually evaluated for impairment, Allowance	94
Loans collectively evaluated for impairment, Recorded Investment	520,158	531,440
Loans collectively evaluated for impairment, Allowance	5,705	10,059
Residential: junior lien
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	1,722	199
Loans collectively evaluated for impairment, Recorded Investment	404,824	415,328
Loans collectively evaluated for impairment, Allowance	6,126	2,611
Consumer
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	1,299	29
Loans collectively evaluated for impairment, Recorded Investment	99,995	126,018
Loans collectively evaluated for impairment, Allowance	2,118	6,241
Foreign
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment		7
Loans collectively evaluated for impairment, Recorded Investment	245,774	245,618
Loans collectively evaluated for impairment, Allowance	$ 1,508	$ 437

X

- Definition

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

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- 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)

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- 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.

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- 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)

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- 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)

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