Non-performing Assets and Impaired Loans - Loans by Credit Grades (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Total	$ 1,067,935	$ 1,188,466
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	504,584	459,558
Commercial [Member] \| Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	156,262	162,694
Commercial [Member] \| Non-owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	224,713	201,763
Commercial [Member] \| Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	400	1,056
Commercial [Member] \| Development & Spec Land Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	21,289	6,963
Commercial [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	101,920	87,082
Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	283,732	440,579
Real Estate [Member] \| Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	176,068	181,450
Real Estate [Member] \| Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	9,508	7,681
Real Estate [Member] \| Mortgage Warehouse [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	98,156	251,448
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	279,619	288,329
Consumer [Member] \| Direct Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	29,983	27,831
Consumer [Member] \| Direct Installment Purchased [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	294	429
Consumer [Member] \| Indirect Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	131,384	133,481
Consumer [Member] \| Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	117,958	126,588
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,019,365	1,107,191
Percentage of total loans	95.45%	93.16%
Pass [Member] \| Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	466,820	391,369
Pass [Member] \| Commercial [Member] \| Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	146,085	137,664
Pass [Member] \| Commercial [Member] \| Non-owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	208,625	171,319
Pass [Member] \| Commercial [Member] \| Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	400	405
Pass [Member] \| Commercial [Member] \| Development & Spec Land Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	19,858	3,171
Pass [Member] \| Commercial [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	91,852	78,810
Pass [Member] \| Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	277,586	431,424
Pass [Member] \| Real Estate [Member] \| Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	170,202	172,586
Pass [Member] \| Real Estate [Member] \| Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	9,228	7,390
Pass [Member] \| Real Estate [Member] \| Mortgage Warehouse [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	98,156	251,448
Pass [Member] \| Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	274,959	284,398
Pass [Member] \| Consumer [Member] \| Direct Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	29,781	27,667
Pass [Member] \| Consumer [Member] \| Direct Installment Purchased [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	294	429
Pass [Member] \| Consumer [Member] \| Indirect Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	130,851	132,589
Pass [Member] \| Consumer [Member] \| Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	114,033	123,713
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	13,861	29,161
Percentage of total loans	1.30%	2.45%
Special Mention [Member] \| Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	13,861	29,161
Special Mention [Member] \| Commercial [Member] \| Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,231	6,407
Special Mention [Member] \| Commercial [Member] \| Non-owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,047	19,440
Special Mention [Member] \| Commercial [Member] \| Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Special Mention [Member] \| Commercial [Member] \| Development & Spec Land Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	91	178
Special Mention [Member] \| Commercial [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	6,492	3,136
Special Mention [Member] \| Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Special Mention [Member] \| Real Estate [Member] \| Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Special Mention [Member] \| Real Estate [Member] \| Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Special Mention [Member] \| Real Estate [Member] \| Mortgage Warehouse [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Special Mention [Member] \| Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Special Mention [Member] \| Consumer [Member] \| Direct Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Special Mention [Member] \| Consumer [Member] \| Direct Installment Purchased [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Special Mention [Member] \| Consumer [Member] \| Indirect Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Special Mention [Member] \| Consumer [Member] \| Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	34,709	50,233
Percentage of total loans	3.25%	4.23%
Substandard [Member] \| Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	23,903	37,147
Substandard [Member] \| Commercial [Member] \| Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	7,946	17,029
Substandard [Member] \| Commercial [Member] \| Non-owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	11,041	10,717
Substandard [Member] \| Commercial [Member] \| Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total		651
Substandard [Member] \| Commercial [Member] \| Development & Spec Land Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,340	3,614
Substandard [Member] \| Commercial [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,576	5,136
Substandard [Member] \| Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	6,146	9,155
Substandard [Member] \| Real Estate [Member] \| Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,866	8,864
Substandard [Member] \| Real Estate [Member] \| Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	280	291
Substandard [Member] \| Real Estate [Member] \| Mortgage Warehouse [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Substandard [Member] \| Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,660	3,931
Substandard [Member] \| Consumer [Member] \| Direct Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	202	164
Substandard [Member] \| Consumer [Member] \| Direct Installment Purchased [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Substandard [Member] \| Consumer [Member] \| Indirect Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	533	892
Substandard [Member] \| Consumer [Member] \| Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,925	2,875
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total		1,881
Percentage of total loans	0.00%	0.16%
Doubtful [Member] \| Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total		1,881
Doubtful [Member] \| Commercial [Member] \| Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total		1,594
Doubtful [Member] \| Commercial [Member] \| Non-owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total		287
Doubtful [Member] \| Commercial [Member] \| Residential Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Doubtful [Member] \| Commercial [Member] \| Development & Spec Land Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Doubtful [Member] \| Commercial [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Doubtful [Member] \| Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Doubtful [Member] \| Real Estate [Member] \| Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Doubtful [Member] \| Real Estate [Member] \| Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Doubtful [Member] \| Real Estate [Member] \| Mortgage Warehouse [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Doubtful [Member] \| Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Doubtful [Member] \| Consumer [Member] \| Direct Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Doubtful [Member] \| Consumer [Member] \| Direct Installment Purchased [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Doubtful [Member] \| Consumer [Member] \| Indirect Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Doubtful [Member] \| Consumer [Member] \| Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total