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	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 9,748	$ 13,374
Loans Past Due Over 90 Days Still Accruing	49	54
Non Performing TDR's	3,426	6,649
Performing TDR's	5,054	3,702
Total Non-Performing Loans	18,277	23,779
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	4,014	5,754
Loans Past Due Over 90 Days Still Accruing	45
Non Performing TDR's	2,116	3,674
Performing TDR's	1,296	1,265
Total Non-Performing Loans	7,471	10,693
Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	293	2,800
Loans Past Due Over 90 Days Still Accruing
Non Performing TDR's	222	1,272
Performing TDR's	778	819
Total Non-Performing Loans	1,293	4,891
Commercial [Member] | Non-owner Occupied Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,289	1,705
Loans Past Due Over 90 Days Still Accruing	45
Non Performing TDR's	1,117	1,605
Performing TDR's	518	446
Total Non-Performing Loans	3,969	3,756
Commercial [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual
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	182	705
Loans Past Due Over 90 Days Still Accruing
Non Performing TDR's
Performing TDR's
Total Non-Performing Loans	182	705
Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,250	544
Loans Past Due Over 90 Days Still Accruing
Non Performing TDR's	777	797
Performing TDR's
Total Non-Performing Loans	2,027	1,341
Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,459	4,565
Loans Past Due Over 90 Days Still Accruing	2	2
Non Performing TDR's	999	2,827
Performing TDR's	2,686	1,761
Total Non-Performing Loans	6,146	9,155
Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,459	4,565
Loans Past Due Over 90 Days Still Accruing	2	2
Non Performing TDR's	719	2,536
Performing TDR's	2,686	1,761
Total Non-Performing Loans	5,866	8,864
Real Estate [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual
Loans Past Due Over 90 Days Still Accruing
Non Performing TDR's	280	291
Performing TDR's
Total Non-Performing Loans	280	291
Real Estate [Member] | Mortgage Warehouse [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual
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	3,275	3,055
Loans Past Due Over 90 Days Still Accruing	2	52
Non Performing TDR's	311	148
Performing TDR's	1,072	676
Total Non-Performing Loans	4,660	3,931
Consumer [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	202	138
Loans Past Due Over 90 Days Still Accruing		26
Non Performing TDR's
Performing TDR's
Total Non-Performing Loans	202	164
Consumer [Member] | Direct Installment Purchased [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual
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	531	866
Loans Past Due Over 90 Days Still Accruing	2	26
Non Performing TDR's
Performing TDR's
Total Non-Performing Loans	533	892
Consumer [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,542	2,051
Loans Past Due Over 90 Days Still Accruing
Non Performing TDR's	311	148
Performing TDR's	1,072	676
Total Non-Performing Loans	$ 3,925	$ 2,875