Non-performing Assets and Impaired Loans - Loans Transferred and Classified as Troubled Debt Restructured Loans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Defaults	Dec. 31, 2012 Defaults
Financing Receivable, Modifications [Line Items]
Number of Defaults	22,000	13,000
Unpaid Principal Balance	$ 3,332	$ 5,373
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	6,000	8,000
Unpaid Principal Balance	1,165	4,142
Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	3,000	4,000
Unpaid Principal Balance	223	2,091
Commercial [Member] | Non-owner Occupied Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	3,000	4,000
Unpaid Principal Balance	942	2,051
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
Unpaid Principal Balance
Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	9,000	5,000
Unpaid Principal Balance	1,252	1,231
Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	9,000	5,000
Unpaid Principal Balance	1,252	1,231
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	7,000
Unpaid Principal Balance	915
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	7,000
Unpaid Principal Balance	$ 915