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Borrowings - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Quarters
Dec. 31, 2012
Dec. 31, 2013
Federal Home Loan Bank Borrowings [Member]
Dec. 31, 2012
Federal Home Loan Bank Borrowings [Member]
Dec. 31, 2003
Trust [Member]
Dec. 31, 2013
Trust [Member]
Unsecured Debt [Member]
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2013
Minimum [Member]
Federal Home Loan Bank Borrowings [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2013
Maximum [Member]
Federal Home Loan Bank Borrowings [Member]
Dec. 31, 2013
London Interbank Offered Rate (LIBOR) [Member]
Borrowings Under Repurchase Agreements [Line items]                          
Additional amount available under FHLB     $ 37,000,000                    
Line of credit with the FHLB     2,000,000                    
Advances outstanding under line of credit     0 0                  
FHLB advances Paid off during period 50,000,000                        
Interest rates ranges of FHLB 4.41%           0.77%     3.69%      
Restructured interest rates ranges of FHLB                 0.77%     2.19%  
Restructured FHLB advance 10,000,000                        
Restructured interest rate 2.19%                        
Extension of maturity period 1 year                        
Outstanding advances from the FHLB 57,000,000 50,000,000                      
Interest rates of outstanding advances from FHLB             0.19% 0.19%   1.17% 1.17%    
Securities sold under Repurchase agreements 0 7,000,000                      
Fixed interest rate 4.3475% 4.3475%                      
Securities sold under repurchase agreements 7,000,000                        
Trust's common securities         100.00%                
Trust preferred securities           8,000,000                
Tier I Capital         25.00%                
Unsecured subordinated debentures           8,248,000              
Debt instrument interest rate description                         Three-month LIBOR plus 3.15%
LIBOR interest rate                         3.15%
Subordinated debentures, interest rate 3.39585%                        
Maturity date of subordinated debentures           Mar. 26, 2033              
Number of consecutive quarters for interest deferment 20                        
Accrued interest payable $ 1,400,000                        
Duration of the Trust 30 years