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Incentive and Restricted Stock Plan and Dividend Reinvestment Plan - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards outstanding (in shares) 0 0 155,500 428,900
Nonstatutory stock options granted since 2006 (in shares) 0 0 0  
Aggregate intrinsic value of options outstanding     $ 0  
Aggregate intrinsic value of options exercisable     0  
Unrecognized compensation expense to be recognized $ 2,500,000      
Weighted average compensation expense recognize period 1 year 6 months 30 days      
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 2,500,000 $ 1,700,000 900,000  
Tax benefit realized on compensation expense $ 900,000 $ 600,000 $ 300,000  
2014 Stock Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of common stock authorized (in shares) 750,000      
Stock plan expiration period 10 years      
Number of awards outstanding (in shares) 0      
2014 Stock Plan | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares granted 110,643 87,841    
2014 Stock Plan | Restricted Stock | Employees and Directors        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares granted 278,939      
2014 Stock Plan | Restricted Stock | Outside Directors        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 1 year      
Restricted shares granted 15,613 16,142 13,824  
LTIP | Time-based and Performance-based Restricted Stocks | Senior Management        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares granted 95,030 71,699 66,631  
LTIP | Time-based Restricted Shares | Senior Management        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted Stock Award vesting after year two, percent 50.00%      
Restricted Stock Award vesting after year three, percent 50.00%      
LTIP | Performance-based Restricted Shares | Senior Management        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years