Non-performing Assets and Impaired Loans - Payment Status by Class of Loan (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	$ 3,108	$ 5,998
60 - 89 Days Past Due	344	744
Greater than 90 Days Past Due	49	54
Total Past Due	3,501	6,796
Loans Not Past Due	1,064,434	1,181,670
Total	1,067,935	1,188,466
30 - 59 Days Past Due, Percentage of Total Loans	0.29%	0.50%
60 - 89 Days Past Due, Percentage of Total Loans	0.03%	0.06%
Greater than 90 Days Past Due, Percentage of Total Loans	0.00%	0.00%
Total Past Due, Percentage of Total Loans	0.33%	0.57%
Loans Not Past Due, Percentage of Total Loans	99.67%	99.43%
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	765	3,414
60 - 89 Days Past Due		182
Greater than 90 Days Past Due	45
Total Past Due	810	3,596
Loans Not Past Due	503,774	455,962
Total	504,584	459,558
Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	341	2,207
60 - 89 Days Past Due		19
Greater than 90 Days Past Due
Total Past Due	341	2,226
Loans Not Past Due	155,921	160,468
Total	156,262	162,694
Commercial [Member] | Non-owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	424	669
60 - 89 Days Past Due		147
Greater than 90 Days Past Due	45
Total Past Due	469	816
Loans Not Past Due	224,244	200,947
Total	224,713	201,763
Commercial [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due
60 - 89 Days Past Due
Greater than 90 Days Past Due
Total Past Due
Loans Not Past Due	400	1,056
Total	400	1,056
Commercial [Member] | Development & Spec Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due
60 - 89 Days Past Due
Greater than 90 Days Past Due
Total Past Due
Loans Not Past Due	21,289	6,963
Total	21,289	6,963
Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due		538
60 - 89 Days Past Due		16
Greater than 90 Days Past Due
Total Past Due		554
Loans Not Past Due	101,920	86,528
Total	101,920	87,082
Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	445	167
60 - 89 Days Past Due	87
Greater than 90 Days Past Due	2	2
Total Past Due	534	169
Loans Not Past Due	283,198	440,410
Total	283,732	440,579
Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	445	167
60 - 89 Days Past Due	87
Greater than 90 Days Past Due	2	2
Total Past Due	534	169
Loans Not Past Due	175,534	181,281
Total	176,068	181,450
Real Estate [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due
60 - 89 Days Past Due
Greater than 90 Days Past Due
Total Past Due
Loans Not Past Due	9,508	7,681
Total	9,508	7,681
Real Estate [Member] | Mortgage Warehouse [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due
60 - 89 Days Past Due
Greater than 90 Days Past Due
Total Past Due
Loans Not Past Due	98,156	251,448
Total	98,156	251,448
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	1,898	2,417
60 - 89 Days Past Due	257	562
Greater than 90 Days Past Due	2	52
Total Past Due	2,157	3,031
Loans Not Past Due	277,462	285,298
Total	279,619	288,329
Consumer [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	120	240
60 - 89 Days Past Due	24	64
Greater than 90 Days Past Due		26
Total Past Due	144	330
Loans Not Past Due	29,839	27,501
Total	29,983	27,831
Consumer [Member] | Direct Installment Purchased [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due
60 - 89 Days Past Due
Greater than 90 Days Past Due
Total Past Due
Loans Not Past Due	294	429
Total	294	429
Consumer [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	1,011	1,105
60 - 89 Days Past Due	175	177
Greater than 90 Days Past Due	2	26
Total Past Due	1,188	1,308
Loans Not Past Due	130,196	132,173
Total	131,384	133,481
Consumer [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	767	1,072
60 - 89 Days Past Due	58	321
Greater than 90 Days Past Due
Total Past Due	825	1,393
Loans Not Past Due	117,133	125,195
Total	$ 117,958	$ 126,588