Non-performing Loans and Impaired Loans - Loans Transferred and Classified as Troubled Debt Restructured Loans Nonaccrual (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014 Defaults	Jun. 30, 2013 Defaults	Jun. 30, 2014 Defaults	Jun. 30, 2013 Defaults
Financing Receivable, Modifications [Line Items]
Number of Defaults	2	1	6	4
Unpaid Principal Balance	$ 274	$ 997	$ 944	$ 1,236
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults			2
Unpaid Principal Balance			371
Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults
Unpaid Principal Balance
Commercial [Member] | Non-owner Occupied Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults
Unpaid Principal Balance
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			371
Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	1		2	3
Unpaid Principal Balance	223		377	239
Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	1		2	3
Unpaid Principal Balance	223		377	239
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	1	2	1
Unpaid Principal Balance	51	997	196	997
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	1	2	1
Unpaid Principal Balance	$ 51	$ 997	$ 196	$ 997