Non-performing Assets and Impaired Loans - Payment Status by Class of Loan (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	$ 3,807	$ 3,108
60 - 89 Days Past Due	1,275	344
Greater than 90 Days Past Due	115	49
Total Past Due	5,197	3,501
Loans Not Past Due	1,372,275	1,064,434
Total	1,377,472us-gaap_NotesReceivableGross	1,067,935us-gaap_NotesReceivableGross
30 - 59 Days Past Due, Percentage of Total Loans	0.28%	0.29%
60 - 89 Days Past Due, Percentage of Total Loans	0.09%	0.03%
Greater than 90 Days Past Due, Percentage of Total Loans	0.01%	0.00%
Total Past Due, Percentage of Total Loans	0.38%	0.33%
Loans Not Past Due, Percentage of Total Loans	99.62%	99.67%
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	535	765
60 - 89 Days Past Due	646
Greater than 90 Days Past Due		45
Total Past Due	1,181	810
Loans Not Past Due	671,878	503,774
Total	673,059	504,584
Commercial [Member] \| Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	103	341
60 - 89 Days Past Due	645
Total Past Due	748	341
Loans Not Past Due	227,632	155,921
Total	228,380	156,262
Commercial [Member] \| Non Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	413	424
Greater than 90 Days Past Due		45
Total Past Due	413	469
Loans Not Past Due	296,886	224,244
Total	297,299	224,713
Commercial [Member] \| Residential Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Not Past Due	2,027	400
Total	2,027	400
Commercial [Member] \| Development & Spec Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Not Past Due	12,097	21,289
Total	12,097	21,289
Commercial [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	19
60 - 89 Days Past Due	1
Total Past Due	20
Loans Not Past Due	133,236	101,920
Total	133,256	101,920
Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	1,033	445
60 - 89 Days Past Due	193	87
Greater than 90 Days Past Due	40	2
Total Past Due	1,266	534
Loans Not Past Due	381,916	283,198
Total	383,182	283,732
Real Estate [Member] \| Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	1,033	445
60 - 89 Days Past Due	193	87
Greater than 90 Days Past Due	40	2
Total Past Due	1,266	534
Loans Not Past Due	241,255	175,534
Total	242,521	176,068
Real Estate [Member] \| Residential Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Not Past Due	11,505	9,508
Total	11,505	9,508
Real Estate [Member] \| Mortgage Warehousing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Not Past Due	129,156	98,156
Total	129,156	98,156
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	2,239	1,898
60 - 89 Days Past Due	436	257
Greater than 90 Days Past Due	75	2
Total Past Due	2,750	2,157
Loans Not Past Due	318,481	277,462
Total	321,231	279,619
Consumer [Member] \| Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	113	120
60 - 89 Days Past Due	4	24
Greater than 90 Days Past Due	10
Total Past Due	127	144
Loans Not Past Due	40,010	29,839
Total	40,137	29,983
Consumer [Member] \| Direct Installment Purchased [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Not Past Due	219	294
Total	219	294
Consumer [Member] \| Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	1,042	1,011
60 - 89 Days Past Due	243	175
Greater than 90 Days Past Due	47	2
Total Past Due	1,332	1,188
Loans Not Past Due	140,536	130,196
Total	141,868	131,384
Consumer [Member] \| Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	1,084	767
60 - 89 Days Past Due	189	58
Greater than 90 Days Past Due	18
Total Past Due	1,291	825
Loans Not Past Due	137,716	117,133
Total	$ 139,007	$ 117,958

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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.

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

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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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