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Loans Receivable and Allowance for Loan Losses - Average Recorded Investment in Impaired Loans and Related Interest Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Financing Receivable, Impaired [Line Items]
Average Impaired Balance	$ 22,938	$ 19,167
Interest Income Recognized	29	5
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Average Impaired Balance	4,249	2,291
Interest Income Recognized	10	0
Commercial Real Estate [Member] | Non-owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Average Impaired Balance	7,049	3,230
Interest Income Recognized	4	0
Commercial Real Estate [Member] | Multi - Family [Member]
Financing Receivable, Impaired [Line Items]
Average Impaired Balance	371	10
Interest Income Recognized	1	0
Commercial Real Estate [Member] | Non-owner Occupied Residential [Member]
Financing Receivable, Impaired [Line Items]
Average Impaired Balance	3,300	4,643
Interest Income Recognized	8	3
Acquisition and Development [Member] | 1-4 Family Residential Construction [Member]
Financing Receivable, Impaired [Line Items]
Average Impaired Balance	0	859
Interest Income Recognized	0	0
Acquisition and Development [Member] | Commercial and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Average Impaired Balance	2,288	3,321
Interest Income Recognized	2	0
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Average Impaired Balance	2,088	1,574
Interest Income Recognized	3	0
Residential Mortgage [Member] | First Lien [Member]
Financing Receivable, Impaired [Line Items]
Average Impaired Balance	3,364	2,635
Interest Income Recognized	1	2
Residential Mortgage [Member] | Home Equity - Term [Member]
Financing Receivable, Impaired [Line Items]
Average Impaired Balance	108	47
Interest Income Recognized	0	0
Residential Mortgage [Member] | Home Equity - Lines of Credit [Member]
Financing Receivable, Impaired [Line Items]
Average Impaired Balance	121	555
Interest Income Recognized	0	0
Installment and Other Loans [Member]
Financing Receivable, Impaired [Line Items]
Average Impaired Balance	0	2
Interest Income Recognized	$ 0	$ 0

X

- Details

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

X

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5258-111524

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration