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Loans, net and allowance for loan losses - Major Classification of Loans by Past Due Status (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due $ 7,167 $ 4,649  
60-89 Days Past Due 1,478 1,717  
Greater than 90 Days 13,621 2,737  
Total Past Due 22,266 9,103  
Current 1,154,351 614,427  
Ending balance 1,176,617 623,530 631,522
Loans > 90 Days and Accruing 1,455 457  
Commercial [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,052 23  
60-89 Days Past Due 105 49  
Greater than 90 Days 4,044 304  
Total Past Due 5,201 376  
Current 345,479 91,348  
Ending balance 350,680 91,724 88,188
Loans > 90 Days and Accruing 6    
Real Estate Commercial [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,641 1,448  
60-89 Days Past Due 75 200  
Greater than 90 Days 4,703 145  
Total Past Due 6,419 1,793  
Current 406,639 215,703  
Ending balance 413,058 217,496 208,875
Loans > 90 Days and Accruing 200    
Real Estate Residential [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 3,676 2,680  
60-89 Days Past Due 985 1,198  
Greater than 90 Days 4,213 2,043  
Total Past Due 8,874 5,921  
Current 313,188 255,991  
Ending balance 322,062 261,912 281,643
Loans > 90 Days and Accruing 678 243  
Consumer [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 798 498  
60-89 Days Past Due 313 270  
Greater than 90 Days 661 245  
Total Past Due 1,772 1,013  
Current 89,045 51,385  
Ending balance 90,817 52,398 52,816
Loans > 90 Days and Accruing $ 571 $ 214