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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 |  |  |  |  |

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