Loans and Allowance for Loan Losses - Summary of Non-Covered Past Due Financial Receivables (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	$ 30,400	$ 40,300
Total Loans	1,618,454	1,450,635
Purchased Non-Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	12,903
Loans 60-89 Days Past Due	3,314
Loans 90 or More Days Past Due	5,289
Total Loans Past Due	21,506
Current Loans	427,247
Total Loans	448,753
Loans 90 Days or More Past Due and Still Accruing
Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	244,373	174,217
Commercial, Financial and Agricultural [Member] | Purchased Non-Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	370
Loans 60-89 Days Past Due	70
Loans 90 or More Days Past Due	11
Total Loans Past Due	451
Current Loans	31,690
Total Loans	32,141
Loans 90 Days or More Past Due and Still Accruing
Real Estate - Construction and Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	146,371	114,199
Real Estate - Construction and Development [Member] | Purchased Non-Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	1,008
Loans 60-89 Days Past Due	89
Loans 90 or More Days Past Due	325
Total Loans Past Due	1,422
Current Loans	29,754
Total Loans	31,176
Loans 90 Days or More Past Due and Still Accruing
Real Estate - Commercial and Farmland [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	808,323	732,322
Real Estate - Commercial and Farmland [Member] | Purchased Non-Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	6,851
Loans 60-89 Days Past Due	2,064
Loans 90 or More Days Past Due	1,516
Total Loans Past Due	10,431
Current Loans	169,467
Total Loans	179,898
Loans 90 Days or More Past Due and Still Accruing
Real Estate - Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	351,886	346,480
Real Estate - Residential [Member] | Purchased Non-Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	4,667
Loans 60-89 Days Past Due	1,074
Loans 90 or More Days Past Due	3,428
Total Loans Past Due	9,169
Current Loans	191,682
Total Loans	200,851
Loans 90 Days or More Past Due and Still Accruing
Consumer Installment Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	34,249	40,178
Consumer Installment Loans [Member] | Purchased Non-Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	7
Loans 60-89 Days Past Due	17
Loans 90 or More Days Past Due	9
Total Loans Past Due	33
Current Loans	4,654
Total Loans	4,687
Loans 90 Days or More Past Due and Still Accruing