Loans - Summary of Major Classifications of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases $ 889,150 $ 582,549    
Less: Unearned fees 429 547    
Total loans and leases 888,721 582,002    
Allowance for loan losses (9,802) (9,119) (10,020) (10,343)
Total net loans and leases 878,919 572,883    
Commercial, Financial, and Agricultural [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 131,657      
Allowance for loan losses (1,523) (1,398) (1,158) (1,423)
Real Estate - Mortgage [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 577,268 403,053    
Allowance for loan losses (5,047) (4,449) (5,094) (5,509)
Real Estate - Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 83,663 58,372    
Allowance for loan losses (647) (964) (497) (1,071)
Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 13,962      
Allowance for loan losses (562) (243) (169) (90)
Leases [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases   6    
Adjustments [Member] | Commercial, Financial, and Agricultural [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 131,657 115,005    
Adjustments [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 13,962 6,113    
Receivables Factoring [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 82,600      
Allowance for loan losses $ (955)