Non-performing Assets and Impaired Loans - Nonaccrual, Loans Past Due Over 90 Days Still on Accrual, and Troubled Debt Restructured ("TDRs") by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 8,773	$ 9,748
Loans Past Due Over 90 Days Still Accruing	203	49
Non Performing TDR's	3,661	3,426
Performing TDR's	4,999	5,054
Total Non-Performing Loans	17,636	18,277
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	3,691	4,014
Loans Past Due Over 90 Days Still Accruing		45
Non Performing TDR's	2,338	2,116
Performing TDR's	1,283	1,296
Total Non-Performing Loans	7,312	7,471
Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	294	293
Loans Past Due Over 90 Days Still Accruing
Non Performing TDR's	81	222
Performing TDR's	769	778
Total Non-Performing Loans	1,144	1,293
Commercial [Member] | Non-owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,192	2,289
Loans Past Due Over 90 Days Still Accruing		45
Non Performing TDR's	1,084	1,117
Performing TDR's	514	518
Total Non-Performing Loans	3,790	3,969
Commercial [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due Over 90 Days Still Accruing
Non Performing TDR's
Performing TDR's
Total Non-Performing Loans
Commercial [Member] | Development & Spec Land Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	162	182
Loans Past Due Over 90 Days Still Accruing
Non Performing TDR's
Performing TDR's
Total Non-Performing Loans	162	182
Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,043	1,250
Loans Past Due Over 90 Days Still Accruing
Non Performing TDR's	1,173	777
Performing TDR's
Total Non-Performing Loans	2,216	2,027
Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,709	2,459
Loans Past Due Over 90 Days Still Accruing	3	2
Non Performing TDR's	1,136	999
Performing TDR's	2,510	2,686
Total Non-Performing Loans	6,358	6,146
Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,709	2,459
Loans Past Due Over 90 Days Still Accruing	3	2
Non Performing TDR's	858	719
Performing TDR's	2,510	2,686
Total Non-Performing Loans	6,080	5,866
Real Estate [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due Over 90 Days Still Accruing
Non Performing TDR's	278	280
Performing TDR's
Total Non-Performing Loans	278	280
Real Estate [Member] | Mortgage Warehousing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due Over 90 Days Still Accruing
Non Performing TDR's
Performing TDR's
Total Non-Performing Loans
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,373	3,275
Loans Past Due Over 90 Days Still Accruing	200	2
Non Performing TDR's	187	311
Performing TDR's	1,206	1,072
Total Non-Performing Loans	3,966	4,660
Consumer [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	289	202
Loans Past Due Over 90 Days Still Accruing	20
Non Performing TDR's
Performing TDR's
Total Non-Performing Loans	309	202
Consumer [Member] | Direct Installment Purchased [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due Over 90 Days Still Accruing
Non Performing TDR's
Performing TDR's
Total Non-Performing Loans
Consumer [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	536	531
Loans Past Due Over 90 Days Still Accruing	103	2
Non Performing TDR's
Performing TDR's
Total Non-Performing Loans	639	533
Consumer [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,548	2,542
Loans Past Due Over 90 Days Still Accruing	77
Non Performing TDR's	187	311
Performing TDR's	1,206	1,072
Total Non-Performing Loans	$ 3,018	$ 3,925