Loans and Allowance for Loan Losses - Summary of Covered Past Due Financial Receivables (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans 30-59 Days Past Due	$ 30,400	$ 40,300
Total Loans	1,618,454	1,450,635
Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans 30-59 Days Past Due	20,990	21,536
Loans 60-89 Days Past Due	6,434	14,479
Loans 90 or More Days Past Due	57,197	108,072
Total Loans Past Due	84,621	144,087
Current Loans	305,616	363,625
Total Loans	390,237	507,712
Loans 90 Days or More Past Due and Still Accruing	346	3,301
Commercial, Financial and Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	244,373	174,217
Commercial, Financial and Agricultural [Member] | Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans 30-59 Days Past Due	3,966	2,390
Loans 60-89 Days Past Due	12	1,105
Loans 90 or More Days Past Due	6,165	10,612
Total Loans Past Due	10,143	14,107
Current Loans	16,407	18,499
Total Loans	26,550	32,606
Loans 90 Days or More Past Due and Still Accruing		98
Real Estate - Construction and Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	146,371	114,199
Real Estate - Construction and Development [Member] | Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans 30-59 Days Past Due	843	1,584
Loans 60-89 Days Past Due	144	2,592
Loans 90 or More Days Past Due	14,055	19,656
Total Loans Past Due	15,042	23,832
Current Loans	28,137	46,352
Total Loans	43,179	70,184
Loans 90 Days or More Past Due and Still Accruing		1,077
Real Estate - Commercial and Farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	808,323	732,322
Real Estate - Commercial and Farmland [Member] | Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans 30-59 Days Past Due	8,482	11,451
Loans 60-89 Days Past Due	4,350	7,373
Loans 90 or More Days Past Due	26,428	52,570
Total Loans Past Due	39,260	71,394
Current Loans	185,191	207,112
Total Loans	224,451	278,506
Loans 90 Days or More Past Due and Still Accruing	346	1,347
Real Estate - Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	351,886	346,480
Real Estate - Residential [Member] | Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans 30-59 Days Past Due	7,648	6,066
Loans 60-89 Days Past Due	1,914	3,396
Loans 90 or More Days Past Due	10,244	24,976
Total Loans Past Due	19,806	34,438
Current Loans	75,367	90,618
Total Loans	95,173	125,056
Loans 90 Days or More Past Due and Still Accruing		779
Consumer Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	34,249	40,178
Consumer Installment Loans [Member] | Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans 30-59 Days Past Due	51	45
Loans 60-89 Days Past Due	14	13
Loans 90 or More Days Past Due	305	258
Total Loans Past Due	370	316
Current Loans	514	1,044
Total Loans	$ 884	$ 1,360