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Stockholders' Equity (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 30, 2011
investor
Jun. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2014
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2014
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
Class of Stock [Line Items]            
Number of institutional investors that purchased warrant | investor 2          
Cash dividends to common stockholders | $   $ 1,313 $ 1,123 $ 2,620 $ 2,243 $ 4,733
Cash dividends paid per common share   $ 0.22 $ 0.19 $ 0.44 $ 0.38  
Performance Shares [Member]            
Class of Stock [Line Items]            
Vesting period of performance-based stock awards       3 years    
Performance Shares [Member] | Minimum [Member]            
Class of Stock [Line Items]            
Vesting percentage of performance-based awards       0.00%    
Performance Shares [Member] | Maximum [Member]            
Class of Stock [Line Items]            
Vesting percentage of performance-based awards       200.00%    
Common stock            
Class of Stock [Line Items]            
Number of common stock shares authorized to be purchased by warrant | shares   157,445   157,445    
Exercise price of warrant to purchase common stock (usd per share)   $ 26.68   $ 26.68    
U.S. Treasury Capital Purchase Program (TCPP) | Common stock            
Class of Stock [Line Items]            
Number of common stock shares authorized to be purchased by warrant | shares   154,242   154,242    
Exercise price of warrant to purchase common stock (usd per share)   $ 27.23   $ 27.23