Loans - Analysis of Information Pertaining to Purchased Non-Covered Impaired Loans (Detail) (Purchased Non-Covered Loans [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	$ 25,710		$ 10,996
Recorded Investment With No Allowance	15,770		6,659
Recorded Investment With Allowance
Total Recorded Investment	15,770		6,659
Related Allowance
Average Recorded Investment	12,582		128
Commercial, Financial and Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	550		19
Recorded Investment With No Allowance	143		11
Recorded Investment With Allowance
Total Recorded Investment	143		11
Related Allowance
Average Recorded Investment	90
Real Estate - Construction and Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	4,649		542
Recorded Investment With No Allowance	2,273		325
Recorded Investment With Allowance
Total Recorded Investment	2,273		325
Related Allowance
Average Recorded Investment	1,243		6
Real Estate - Commercial and Farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	9,848		2,673
Recorded Investment With No Allowance	6,647		1,653
Recorded Investment With Allowance
Total Recorded Investment	6,647		1,653
Related Allowance
Average Recorded Investment	5,043		32
Real Estate - Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	10,598		7,712
Recorded Investment With No Allowance	6,658		4,658
Recorded Investment With Allowance
Total Recorded Investment	6,658		4,658
Related Allowance
Average Recorded Investment	6,175		90
Consumer Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Contractual Principal Balance	65		20
Recorded Investment With No Allowance	49		12
Recorded Investment With Allowance
Total Recorded Investment	49		12
Related Allowance
Average Recorded Investment	$ 31