Loans and Allowance for Loan Losses - Summary of Excluding Purchased Non-Covered and 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
Excluding Purchased Non-Covered and Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	21,890	11,825
Loans 60-89 Days Past Due	3,661	6,097
Loans 90 or More Days Past Due	27,659	34,287
Total Loans Past Due	53,210	52,209
Current Loans	1,565,244	1,398,426
Total Loans	1,618,454	1,450,635
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] | Excluding Purchased Non-Covered and Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	10,893	258
Loans 60-89 Days Past Due	272	312
Loans 90 or More Days Past Due	4,081	3,969
Total Loans Past Due	15,246	4,539
Current Loans	229,127	169,678
Total Loans	244,373	174,217
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] | Excluding Purchased Non-Covered and Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	1,026	347
Loans 60-89 Days Past Due	69	332
Loans 90 or More Days Past Due	3,935	8,969
Total Loans Past Due	5,030	9,648
Current Loans	141,341	104,551
Total Loans	146,371	114,199
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] | Excluding Purchased Non-Covered and Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	3,981	2,867
Loans 60-89 Days Past Due	1,388	2,296
Loans 90 or More Days Past Due	7,751	9,544
Total Loans Past Due	13,120	14,707
Current Loans	795,203	717,615
Total Loans	808,323	732,322
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] | Excluding Purchased Non-Covered and Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	5,422	7,651
Loans 60-89 Days Past Due	1,735	2,766
Loans 90 or More Days Past Due	11,587	10,990
Total Loans Past Due	18,744	21,407
Current Loans	333,142	325,073
Total Loans	351,886	346,480
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] | Excluding Purchased Non-Covered and Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans 30-59 Days Past Due	568	702
Loans 60-89 Days Past Due	197	391
Loans 90 or More Days Past Due	305	815
Total Loans Past Due	1,070	1,908
Current Loans	33,179	38,270
Total Loans	34,249	40,178
Loans 90 Days or More Past Due and Still Accruing
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	33,252	43,239
Other [Member] | Excluding Purchased Non-Covered and Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans	33,252	43,239
Total Loans	33,252	43,239
Loans 90 Days or More Past Due and Still Accruing