Business Combinations - Additional Information (Detail) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Aug. 29, 2014
Dec. 15, 2014
Business Acquisition [Line Items]      
Goodwill $ 28,834,000   $ 5,719,000
Discount on purchased factored receivables 174,000    
Direct stock issuance cost charged against additional paid in capital 28,000    
Minimum [Member]      
Business Acquisition [Line Items]      
Average life for CBI's receivables 35 days    
Maximum [Member]      
Business Acquisition [Line Items]      
Average life for CBI's receivables 40 days    
CBI [Member]      
Business Acquisition [Line Items]      
Acquisition date Aug. 29, 2014    
Acquired percentage 70.00%    
Consideration paid in cash 16,181,000 16,181,000  
Goodwill 23,115,000 23,115,000  
CBI [Member] | Option To Purchase [Member]      
Business Acquisition [Line Items]      
Acquired percentage 30.00%    
CBI [Member] | Option To Purchase [Member] | Minimum [Member]      
Business Acquisition [Line Items]      
Acquisition date Aug. 29, 2019    
CBI [Member] | Option To Purchase [Member] | Maximum [Member]      
Business Acquisition [Line Items]      
Acquisition date Aug. 29, 2022    
United Group Banking Company of Florida [Member]      
Business Acquisition [Line Items]      
Acquisition date     Dec. 15, 2014
Consideration paid in cash     2,950,000
Goodwill 5,719,000   5,719,000
Business acquisition, fraction of shares issuable to United's common shareholders     0.057794
Business acquisition exchange price per share     $ 1.30
Consideration paid in shares, value     2,954,000
Consideration paid in shares     1,617,027
Estimate value of the consideration     33,309,000
Direct stock issuance cost charged against additional paid in capital     272,000
Acquisition expense charged to other noninterest expense     $ 368,000
Fair value determinant description One year after the closing date of the acquisition    
Prior Acquisition [Member]      
Business Acquisition [Line Items]      
Number of acquisitions prior to fiscal year 0