Segment Reporting - Schedule of Reconciliation of Reportable Segment Revenue, Expenses and Profit (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Interest income $ 31,342 $ 23,312 $ 19,952
Interest expense 2,869 2,613 3,280
Net interest income 28,473 20,699 16,672
Provision for loan and lease losses 978   125
Noninterest income 5,032 5,302 4,665
Noninterest expense 23,453 19,685 18,084
Earnings before income taxes 9,074 6,316 3,128
Income tax expense 3,159 2,310 1,071
Noncontrolling interest (512)    
Net earnings 5,403 4,006 2,057
Total assets 1,138,426 791,781 693,359
Operating Segments [Member] | Retail and Commercial Banking [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Interest income 27,144 22,893 19,517
Interest expense 2,746 2,471 3,128
Net interest income 24,398 20,422 16,389
Provision for loan and lease losses     125
Noninterest income 811 617 760
Noninterest expense 18,048 15,819 14,912
Earnings before income taxes 7,161 5,220 2,112
Income tax expense 2,627 1,894 685
Net earnings 4,534 3,326 1,427
Total assets 1,099,191 784,622 679,523
Operating Segments [Member] | Mortgage Division [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Interest income 410 419 435
Interest expense 123 142 152
Net interest income 287 277 283
Noninterest income 4,199 4,685 3,905
Noninterest expense 3,681 3,866 3,172
Earnings before income taxes 805 1,096 1,016
Income tax expense 306 416 386
Net earnings 499 680 630
Total assets 9,329 7,159 13,836
Operating Segments [Member] | Receivables Factoring [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Interest income 4,345    
Interest expense 731    
Net interest income 3,614    
Provision for loan and lease losses 804    
Noninterest income 22    
Noninterest expense 1,724    
Earnings before income taxes 1,108    
Income tax expense 226    
Noncontrolling interest (512)    
Net earnings 370    
Total assets 105,330    
Elimination Entries [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Interest income (557)    
Interest expense (731)    
Net interest income 174    
Provision for loan and lease losses 174    
Total assets $ (75,424)