Loans and Allowance for Loan Losses - Analysis of Information Pertaining to Purchased Non-Covered Impaired Loans (Detail) (Purchased Non-Covered Loans [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	$ 19,970
Recorded Investment With No Allowance	12,597
Recorded Investment With Allowance
Total Recorded Investment	12,597
Related Allowance
Average Recorded Investment	242
Commercial, Financial and Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	19
Recorded Investment With No Allowance	11
Recorded Investment With Allowance
Total Recorded Investment	11
Related Allowance
Real Estate - Construction and Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	5,719
Recorded Investment With No Allowance	3,690
Recorded Investment With Allowance
Total Recorded Investment	3,690
Related Allowance
Average Recorded Investment	71
Real Estate - Commercial and Farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	4,563
Recorded Investment With No Allowance	2,881
Recorded Investment With Allowance
Total Recorded Investment	2,881
Related Allowance
Average Recorded Investment	55
Real Estate - Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	9,612
Recorded Investment With No Allowance	5,978
Recorded Investment With Allowance
Total Recorded Investment	5,978
Related Allowance
Average Recorded Investment	115
Consumer Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	57
Recorded Investment With No Allowance	37
Recorded Investment With Allowance
Total Recorded Investment	37
Related Allowance
Average Recorded Investment	$ 1