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Non-performing Loans and Impaired Loans - Loans Transferred and Classified as Troubled Debt Restructured Loans (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013 Defaults	Sep. 30, 2012 Defaults
Financing Receivable, Modifications [Line Items]
Number of Defaults	18,000	7,000
Unpaid Principal Balance	$ 3,163	$ 2,691
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	3,000	6,000
Unpaid Principal Balance	149	2,109
Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	2,000	3,000
Unpaid Principal Balance	81	1,472
Commercial [Member] | Non Owner Occupied Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	1,000	3,000
Unpaid Principal Balance	68	637
Commercial [Member] | Residential Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults
Unpaid Principal Balance
Commercial [Member] | Development & Spec Land Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults
Unpaid Principal Balance
Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults
Unpaid Principal Balance
Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	8,000	1,000
Unpaid Principal Balance	1,132	582
Real Estate [Member] | Residential mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	8,000	1,000
Unpaid Principal Balance	1,132	582
Real Estate [Member] | Residential Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults
Unpaid Principal Balance
Real Estate [Member] | Mortgage Warehousing [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults
Unpaid Principal Balance
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	7,000
Unpaid Principal Balance	1,882
Consumer [Member] | Direct Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults
Unpaid Principal Balance
Consumer [Member] | Direct Installment Purchased [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults
Unpaid Principal Balance
Consumer [Member] | Indirect Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults
Unpaid Principal Balance
Consumer [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	7,000
Unpaid Principal Balance	$ 1,882

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524

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X

- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration