Loans - Summary of Covered Past Due Financial Receivables (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans 30-59 Days Past Due	$ 8,400		$ 20,700
Total Loans	1,770,059	1,618,454	1,555,827
Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans 30-59 Days Past Due	9,456	20,990	13,572
Loans 60-89 Days Past Due	1,804	6,434	5,891
Loans 90 or More Days Past Due	31,055	57,197	76,904
Total Loans Past Due	42,315	84,621	96,367
Current Loans	288,935	305,616	347,150
Total Loans	331,250	390,237	443,517
Loans 90 Days or More Past Due and Still Accruing		346	1,107
Commercial, Financial and Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	304,588	244,373	208,424
Commercial, Financial and Agricultural [Member] | Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans 30-59 Days Past Due	16	3,966	529
Loans 60-89 Days Past Due	467	12	441
Loans 90 or More Days Past Due	6,909	6,165	7,333
Total Loans Past Due	7,392	10,143	8,303
Current Loans	17,817	16,407	19,068
Total Loans	25,209	26,550	27,371
Loans 90 Days or More Past Due and Still Accruing			63
Real Estate - Construction and Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	149,346	146,371	134,607
Real Estate - Construction and Development [Member] | Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans 30-59 Days Past Due	551	843	2,672
Loans 60-89 Days Past Due	459	144	743
Loans 90 or More Days Past Due	7,708	14,055	15,911
Total Loans Past Due	8,718	15,042	19,326
Current Loans	22,882	28,137	33,646
Total Loans	31,600	43,179	52,972
Loans 90 Days or More Past Due and Still Accruing			348
Real Estate - Commercial and Farmland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	850,000	808,323	788,654
Real Estate - Commercial and Farmland [Member] | Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans 30-59 Days Past Due	6,399	8,482	4,020
Loans 60-89 Days Past Due	139	4,350	3,929
Loans 90 or More Days Past Due	10,443	26,428	41,250
Total Loans Past Due	16,981	39,260	49,199
Current Loans	171,662	185,191	205,903
Total Loans	188,643	224,451	255,102
Loans 90 Days or More Past Due and Still Accruing		346	636
Real Estate - Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	422,731	366,882	357,685
Real Estate - Residential [Member] | Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans 30-59 Days Past Due	2,490	7,648	6,283
Loans 60-89 Days Past Due	690	1,914	772
Loans 90 or More Days Past Due	5,939	10,244	12,155
Total Loans Past Due	9,119	19,806	19,210
Current Loans	76,399	75,367	87,897
Total Loans	85,518	95,173	107,107
Loans 90 Days or More Past Due and Still Accruing			60
Consumer Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	31,902	34,249	36,923
Consumer Installment Loans [Member] | Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans 30-59 Days Past Due		51	68
Loans 60-89 Days Past Due	49	14	6
Loans 90 or More Days Past Due	56	305	255
Total Loans Past Due	105	370	329
Current Loans	175	514	636
Total Loans	$ 280	$ 884	$ 965