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Loans - Schedule of Loan Assigned Risk Rating within 12 Months of Balance Sheet Date (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment $ 758,996 $ 518,882
Commercial, Industrial, and Agricultural [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 291,704 257,091
Commercial Mortgages [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 467,292 261,791
Pass [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 671,744 460,129
Pass [Member] | Commercial, Industrial, and Agricultural [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 266,868 234,835
Pass [Member] | Commercial Mortgages [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 404,876 225,294
Special Mention [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 22,132 18,935
Special Mention [Member] | Commercial, Industrial, and Agricultural [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 5,377 6,641
Special Mention [Member] | Commercial Mortgages [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 16,755 12,294
Substandard [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 64,254 38,960
Substandard [Member] | Commercial, Industrial, and Agricultural [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 19,318 15,459
Substandard [Member] | Commercial Mortgages [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 44,936 23,501
Doubtful [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 866 858
Doubtful [Member] | Commercial, Industrial, and Agricultural [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment 141 156
Doubtful [Member] | Commercial Mortgages [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable recorded investment $ 725 $ 702