Non-performing Assets and Impaired Loans - Loans Transferred and Classified as Troubled Debt Restructured Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 Defaults	Mar. 31, 2013 Defaults
Financing Receivable, Modifications [Line Items]
Number of Defaults	3	8
Unpaid Principal Balance	$ 544	$ 1,327
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	2	3
Unpaid Principal Balance	398	146
Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults		2
Unpaid Principal Balance		76
Commercial [Member] | Non-owner Occupied Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults		1
Unpaid Principal Balance		70
Commercial [Member] | Residential Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults
Unpaid Principal Balance
Commercial [Member] | Development & Spec Land Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults
Unpaid Principal Balance
Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	2
Unpaid Principal Balance	398
Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults		3
Unpaid Principal Balance		390
Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults		3
Unpaid Principal Balance		390
Real Estate [Member] | Residential Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults
Unpaid Principal Balance
Real Estate [Member] | Mortgage Warehousing [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults
Unpaid Principal Balance
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	1	2
Unpaid Principal Balance	146	791
Consumer [Member] | Direct Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults
Unpaid Principal Balance
Consumer [Member] | Direct Installment Purchased [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults
Unpaid Principal Balance
Consumer [Member] | Indirect Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults
Unpaid Principal Balance
Consumer [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	1	2
Unpaid Principal Balance	$ 146	$ 791