Non-performing Loans and Impaired Loans - Payment Status by Class of Loan (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	$ 2,682	$ 3,807
60 - 89 Days Past Due	1,263	1,275
Greater than 90 Days Past Due	19	115
Total Past Due	3,964	5,197
Loans Not Past Due	1,456,353	1,372,275
Total	1,460,317us-gaap_NotesReceivableGross	1,377,472us-gaap_NotesReceivableGross
30 - 59 Days Past Due, Percentage of Total Loans	0.18%	0.28%
60 - 89 Days Past Due, Percentage of Total Loans	0.09%	0.09%
Greater than 90 Days Past Due, Percentage of Total Loans	0.00%	0.01%
Total Past Due, Percentage of Total Loans	0.27%	0.38%
Loans Not Past Due, Percentage of Total Loans	99.73%	99.62%
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	586	535
60 - 89 Days Past Due	222	646
Total Past Due	808	1,181
Loans Not Past Due	693,699	671,878
Total	694,507	673,059
Commercial [Member] \| Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	266	103
60 - 89 Days Past Due	138	645
Total Past Due	404	748
Loans Not Past Due	239,623	227,632
Total	240,027	228,380
Commercial [Member] \| Non Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due		413
60 - 89 Days Past Due	84
Total Past Due	84	413
Loans Not Past Due	308,336	296,886
Total	308,420	297,299
Commercial [Member] \| Residential Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Not Past Due	3,409	2,027
Total	3,409	2,027
Commercial [Member] \| Development & Spec Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Not Past Due	11,229	12,097
Total	11,229	12,097
Commercial [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	320	19
60 - 89 Days Past Due		1
Total Past Due	320	20
Loans Not Past Due	131,102	133,236
Total	131,422	133,256
Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	357	1,033
60 - 89 Days Past Due	435	193
Greater than 90 Days Past Due		40
Total Past Due	792	1,266
Loans Not Past Due	437,951	381,916
Total	438,743	383,182
Real Estate [Member] \| Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	357	1,033
60 - 89 Days Past Due	435	193
Greater than 90 Days Past Due		40
Total Past Due	792	1,266
Loans Not Past Due	243,289	241,255
Total	244,081	242,521
Real Estate [Member] \| Residential Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Not Past Due	15,763	11,505
Total	15,763	11,505
Real Estate [Member] \| Mortgage Warehousing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Not Past Due	178,899	129,156
Total	178,899	129,156
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	1,739	2,239
60 - 89 Days Past Due	606	436
Greater than 90 Days Past Due	19	75
Total Past Due	2,364	2,750
Loans Not Past Due	324,703	318,481
Total	327,067	321,231
Consumer [Member] \| Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	142	113
60 - 89 Days Past Due	7	4
Greater than 90 Days Past Due		10
Total Past Due	149	127
Loans Not Past Due	41,327	40,010
Total	41,476	40,137
Consumer [Member] \| Direct Installment Purchased [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Not Past Due	195	219
Total	195	219
Consumer [Member] \| Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	559	1,042
60 - 89 Days Past Due	80	243
Greater than 90 Days Past Due	19	47
Total Past Due	658	1,332
Loans Not Past Due	146,280	140,536
Total	146,938	141,868
Consumer [Member] \| Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	1,038	1,084
60 - 89 Days Past Due	519	189
Greater than 90 Days Past Due		18
Total Past Due	1,557	1,291
Loans Not Past Due	136,901	137,716
Total	$ 138,458	$ 139,007

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Financing receivable recorded investment not past due.

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Financing receivable recorded investment not past due percentage.

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Financing receivable recorded investment past due percentage.

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- Definition

Financing receivable recorded investment sixty to eighty nine days past due percentage.

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- Definition

Financing receivable recorded investment thirty to fifty nine days past due percentage.

+ References

No definition available.

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- Definition

Financing receivables that are less than 60 days past due but more than 29 days past due.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7A

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524

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- Definition

Financing receivables that are less than 90 days past due but more than 59 days past due.

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- Definition

Financing receivables that are equal to or greater than 90 days past due.

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- Definition

Recorded Investment in financing receivables that are past due at the balance sheet date.

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- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(3))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Subparagraph 3

-Article 9

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