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Allowance for Probable Loan Losses (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	$ 79,473	$ 83,005
Loans individually evaluated for impairment, Allowance	15,011	4,746
Loans collectively evaluated for impairment, Recorded Investment	4,747,036	4,691,999
Loans collectively evaluated for impairment, Allowance	47,957	53,447
Commercial
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	33,108	32,768
Loans individually evaluated for impairment, Allowance	11,544	1,477
Loans collectively evaluated for impairment, Recorded Investment	835,849	736,342
Loans collectively evaluated for impairment, Allowance	9,382	10,155
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	26,172	28,660
Loans individually evaluated for impairment, Allowance	823	539
Loans collectively evaluated for impairment, Recorded Investment	1,059,334	1,119,009
Loans collectively evaluated for impairment, Allowance	10,230	12,181
Commercial real estate: farmland and commercial
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	11,900	13,945
Loans individually evaluated for impairment, Allowance	2,644	2,730
Loans collectively evaluated for impairment, Recorded Investment	1,697,537	1,659,377
Loans collectively evaluated for impairment, Allowance	18,007	19,150
Commercial real estate: multifamily
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	338	353
Loans collectively evaluated for impairment, Recorded Investment	78,516	82,595
Loans collectively evaluated for impairment, Allowance	609	694
Residential: first lien
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	4,546	3,656
Loans collectively evaluated for impairment, Recorded Investment	445,845	453,075
Loans collectively evaluated for impairment, Allowance	3,868	4,390
Residential: junior lien
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	1,702	1,850
Loans collectively evaluated for impairment, Recorded Investment	376,995	379,886
Loans collectively evaluated for impairment, Allowance	4,011	4,448
Consumer
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	1,245	1,326
Loans collectively evaluated for impairment, Recorded Investment	68,785	73,188
Loans collectively evaluated for impairment, Allowance	820	1,289
Foreign
Loan loss allowances, impaired financing receivable, evaluated individually or collectively
Loans individually evaluated for impairment, Recorded Investment	462	447
Loans collectively evaluated for impairment, Recorded Investment	184,175	188,527
Loans collectively evaluated for impairment, Allowance	$ 1,030	$ 1,140

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

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

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X

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible 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

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

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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

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

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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

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

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