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Borrowings - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2011
Dec. 31, 2012
Debt Instrument [Line Items]      
Weighted average rate of federal funds purchased 0.36%    
Weighted average rate of retail repurchase agreements 0.38%   0.57%
Qualifying loans $ 1,130,000,000   $ 998,140,000
Gain on repayment of FHLB borrowings   (471,000)  
Junior subordinated debentures issued 15,460,000    
Libor rate 2.95%    
FHLB Borrowings
      
Debt Instrument [Line Items]      
Weighted average contractual rate 4.12%   3.86%
Weighted average contractual maturity period 4 years 6 months 26 days    
Unused borrowing capacity 324,340,000    
FHLB Prepaid borrowing amount 11,470,000    
Gain on repayment of FHLB borrowings 296,000    
Wholesale Repurchase Agreement
      
Debt Instrument [Line Items]      
Weighted average contractual rate 3.71%   3.34%
Weighted average contractual maturity period 4 years 29 days    
FHLB Prepaid borrowing amount $ 8,150,000