Loans - Summary of Aging of Recorded Investment in Past Due and Non-accrual Loan (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days 6 Past Due $ 6,904 $ 343
0-89 Days Past Due 2,976  
> 90 Days Past Due 1,921 2,579
Total Past Due 11,801 2,922
Current 877,349 579,627
Total 889,150 582,549
Non-accrual 4,865 3,371
Commercial, Financial, and Agricultural [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 131,657  
Total 131,657  
Real Estate - Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days 6 Past Due 191 343
0-89 Days Past Due 1,963  
> 90 Days Past Due 1,572 2,579
Total Past Due 3,726 2,922
Current 573,542 400,131
Total 577,268 403,053
Non-accrual 4,133 3,344
Real Estate - Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days 6 Past Due 198  
Total Past Due 198  
Current 83,465 58,372
Total 83,663 58,372
Non-accrual 676  
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days 6 Past Due 188  
> 90 Days Past Due 132  
Total Past Due 320  
Current 13,642  
Total 13,962  
Non-accrual 56  
Leases [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current   6
Total   6
Receivables Factoring [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days 6 Past Due 6,327  
0-89 Days Past Due 1,013  
> 90 Days Past Due 217  
Total Past Due 7,557  
Current 75,043  
Total 82,600  
Adjustments [Member] | Commercial, Financial, and Agricultural [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current   115,005
Total 131,657 115,005
Non-accrual   27
Adjustments [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current   6,113
Total $ 13,962 $ 6,113