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Common Stock and Preferred Stock - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
Restricted Stock
Year
Jun. 30, 2011
Restricted Stock
May 16, 2012
Common Stock Offering
Jun. 30, 2012
Dividend and Distribution Reinvestment and Share Purchase Plan
Class of Stock [Line Items]                  
Common stock, share outstanding 13,758,805 10,934,630 13,758,805 10,934,630 10,954,065        
Common stock, share issued               2,760,000  
Common stock price per share               $ 25.25  
Shares of common stock pursuant to the underwriters               360,000  
Proceed from issuance of common stock               $ 65,600,000 $ 528,400
Sale of Common Stock                 19,919
Sale of Common Stock, Price Per Share                 $ 26.53
Restricted stock Vesting Period           4 years      
Restricted stock Vesting Percentage Annually           25.00%      
Restricted stock available for Awards           677,500      
Restricted stock available for Awards           20,000      
Restricted stock Issue date           Feb. 03, 2012      
Restricted stock Issued           25,600      
Restricted Stock Grant date Market Value           720,896      
Restricted Stock Non-Vested           44,898 43,993    
Restricted Stock Weighted Average Grant Date Fair Value           $ 24.95 $ 22.11    
Share Based compensation Expense           1,000,000 400,000    
unrecognized share Based compensation           900,000      
Share Compensation Recognition period           2.8      
Restricted shares forfeited           779      
Forfeitures or cancellations under the Stock Plan           0      
Restricted stock Issued 0   0            
Dividend Declared $ 100,000 $ 100,000 $ 100,000 $ 100,000